Apparatus for drying sand.



No. 745,639. PA-TBNTED'DEal, 1.903..

. R. TANNER al G. ToLAAs.

APPARATUS POR DRYING SAND.

APPLIOATION FILED FEB. 7. 1902.

N0 MODEL.

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/Vefllbm Q/ Mm UNITED STATES Patented December 1, 1903'.

PATENT Erice.

.APPARATUS Fos DRYING SAND.

SPECIFiCATION forming part of Letters Patent No. 745,689, dated December 1, 1903. Application tiled February 7, 1902. Serial No. 93.020. (No model.)

To all whom it may concern,.-4

Beit known that we, RUDOLF TANNER, a subject of the King of Sweden andNorway, and CLE. TOLAAS,a citizen of the United States of America, both residing at St. Paul, in the county of Ramsey and State of Minnesota, have, as joint inventors, invented a new and useful Apparatus for a Gontinual Process and an Apparatus for Evaporatiug Moisture from Sand and other Fine-Grained Mineral Suhstances, of which the following is a specification.

Our invention has for its object to provide an improved sand-drying apparatus; and to this end it consists of the novel devicesl and combinations of devices hereinafter described, and defined in the claims.

The apparatus is illustrated in the accompanying drawings, wherein like characters indicate like parts throughout the several views.

Figure l is a vertical section through the entire apparatus on the line 0c a: of Fig. 3. Fig. 2 is a View, partly in front elevation and partly in vertical section, on the irregular line y y of Fig. l; and Fig. 3 is a horizontal section on the line z z of Fig. l.

The main body of the drying apparatus is in the form of a vertical duct or fine formed by walls a, which in the illustration given afford a due which is rectangular in cross-sec tion. The vertical duct or flue is provided with lateral openings h, c, d', f, and g. The openings c and d connect the due with alaterally bulged or extendedl tire chamber jp. This dre-chamber p is provided with air-holes s, with a sliding gate r, having handle r'.. In the fire-chamber p is placed a gas-burner t, which may be of any suitable construction and may be connected either to the elevated oil-tank 'w or to a source of gas-supply by means of a pipe t', which, as shown, is brought out from the apparatus through a passage fu.

in the gate rr' and is provided with a valve fv.- 45

Attached to the top of a duct or flue a is a cylindrical spout of a hopper or case h. The feed-screw vl is journaled at its lower end in a bearing k, depending from the case h, and at its upper end it is journaled in a support (not shown) and is provided with an agitatingarmj. Said screwt' receives motion from Ving e.

a driving shaft or meinberl, connected toits upper end.

'.ln the upper parts of the fine or duct d are placed alternated series or groups of parallely ward through the lateral openings f, is a perforato plate or screen o. As shown, said 'screen is supported by ledges o ou the sides of the flue or duct a.

Below the opening e is an inclined imperforate plate q, which projects outward through the openingg in one side wall of the duct and is, as shown, supported by ledges q' on the front and rear .walls of the duct or due a. The said openings e and g, it will be noted, are both located Vbelow the screen o.

When the burner t is lighted, a draft will be created, and the hot air from the lirecharnber p, passing through the opening c, will rise through the tine or duct a and will pass outward through the opening h in the top of said fine, while cold air will be drawn into the said lire-chamberp through the open- If desired, a lforced draft of air may he produced through the said due or duct a by a suitable device-such, for instance, as the fan b', which, as shown, is connected to the outlet-passage h by a tube b".

The sand which is delivered into the hopper .his bythe feed-screw t fed at the proper rate of speed into the upper end of the due or duct 'ct and falling onto the bars m it is cut into IOO through the screen o, is quite highly heated,

. and in this condition it passes directly through instead of a burner t a heating-coil might be placed in the so-called lire-chamber. Again, a hot blast of air from a furnace might be directed into the said tire-chamber. In short,

vany arrangement whereby the heat of the dried sand is caused to effect a preliminary heating of the air which is to be used after further heating to dry the sand would be within the scope of our invention. The device is of course capable of use for drying various other materials than sand. It might,

for instance, be used for drying grain.

What we claim, and desireto secure by Letters Patent of the United States, is as follows: l. In an apparatus adapted for drying sand, the combination with a vertical flue having an inclined screen at its lower portion, of aY tire-chamber opening into one side of said flue both above and below said screen, means for heating air within said fire-chamber, and a cold-air-inlet passage openinginto said flue below said screen whereby the cold air is caused to pass though the hot and dry sand precipitated through said screen, substantially as described.

2. The combination with the iiue d having the deflecting-plate n and inclined screen o, of the fire-chamber@ opening into said flue at c and d, an air-heating device located within said chamber p, said ue also having'the discharge-passage f and cold-air-inlet passage e, the former of which is located above and the latter below said screen, substantially as described.

3. The combination withthe flue a having the deflecting-plate n inclined screen o, discharge-passage f and cold-air-inlet passage e, ofthe fire-chamberp opening into said flue through the passages c and d, the burnert Within said lire-box, the series of parallel bars m at right angles to each other in the upper portion of said flue, and means for delivering sand into the upper end of said flue, substantially as described.

RUDOLF TANNER. OLE TOLAAS. Witnesses:

JOSEPH SEE, J. D. KOREN. 

